Since Croatia officially adopted the Euro (€) as its national currency on January 1, 2023, you absolutely need euros for your 2026 trip. While you can obtain them before you leave, most financial experts recommend a "digital-first" strategy. Croatia is increasingly cashless, and using a travel-friendly debit card (like Wise or Revolut) at a local bank-owned ATM upon arrival usually yields a better exchange rate than buying physical cash at a home-country airport. However, carrying some "emergency" physical euros is essential, as many small coastal "konobas" (taverns), local markets, and public toilets still operate on a cash-only basis. If you have leftover "Kuna" from a pre-2023 trip, they can no longer be used for payment, though some national banks may still exchange them. For 2026, your best bet is to rely on your card for hotels and dinners while keeping about €50–€100 in small denominations for the daily island-hopping expenses.